I was flipping through a Harken catalog and saw something that had me retake the whole shackless halyard sheet thing. What caught my eye was the "soft" high load snatch blocks they have or more to the point the way the are attached. Using this approach to line attachment to sails seems like a very simple way to go. Essentially a loop of that passed through a keeper ring or strap and is made to a half round or round cleat. This should be relativly simple to incorporate into the head clew and tack of a sail. Then all you would need is a spliced eye on halyards sheets etc. The two down sides I could see would be having to convert all of your sails, and there could be a chance of it coming undone on a clew if the sail was flogging pretty badly. The attachment point could probably be made at a piece that bolts thru the ring in the sail catching the loop on one end and the cleat on the other with keeper loop stiched to the sail.
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Jake